JP2008206958A - Wiping cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiping cloth having excellent wiping performance both aqueous and oily contaminations by solving problems of a conventional technique. <P>SOLUTION: The wiping close at least partially includes a cellulose ester fiver having an official regain of 3-8% and a synthetic fiber having an official regain of 0-2.5%. The ratio of the cellulose ester fiber to the synthetic fiber present on the surface of the wiping cloth is 30:70 to 70:30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wiping cloth including at least part of cellulose ester fibers and synthetic fibers. More specifically, the present invention relates to a wiping cloth having excellent wiping performance against both aqueous stains and oily stains containing at least a part of cellulose ester fibers having a specific official moisture content and synthetic fibers.

  Cellulosic materials have recently attracted a great deal of attention as biomass produced on a large scale on the earth and as materials that can be biodegraded in a natural environment. In addition, since the cellulosic material has high hydrophilicity, when it is made into a fiber, it has an advantage of being excellent in moisture absorption / release.

  Conventionally, since cellulosic fibers such as cotton are hydrophilic fibers, they have been used as wiping cloths for cleaning cloths, wiping glasses and wiping lenses. Patent Document 1 proposes a technique for providing a fabric excellent in wiping performance of aqueous stains and oily stains by interweaving cotton that is hydrophilic fibers and polyester that is hydrophobic fibers. However, this proposal has a problem that fine dust removal performance is poor due to the large single yarn fineness of cotton. Furthermore, since cotton is in the form of spun yarn obtained by spinning short fibers, there is a problem that fluff falls on the surface of the object to be wiped and remains on the surface of the wipe.

  On the other hand, fabrics and non-woven fabrics have been proposed in which the surface area of the fibers constituting the wiping cloth is increased to achieve higher wiping efficiency and finer dirt and dust that can be wiped off. Patent Document 2 proposes a technique for providing a fabric made of polyester microfiber and having excellent wiping performance. However, this proposal has a problem that although the wiping performance against oily dirt is excellent, the wiping performance against water-based dirt is not sufficiently satisfied.

As described above, in the prior art, it is impossible to obtain a wiping cloth having a sufficient wiping performance for both aqueous stains and oily stains.
JP 2003-119645 A JP 2005-179846 A

  The problem of the present invention is to solve the above-mentioned problems of the prior art, and consists of a hydrophilic cellulose ester-based fine fiber and a lipophilic synthetic fiber, and has excellent wiping performance against both aqueous and oily soils. It is to provide a wiping cloth having the following.

  The subject of the present invention is a wiping cloth that includes at least a part of cellulose ester fiber having an official moisture content of 3 to 8% and a synthetic fiber having an official moisture content of 0 to 2.5%, The problem can be solved by a wiping cloth characterized in that the ratio of the cellulose ester fiber and the synthetic fiber existing on the surface of the wiping cloth is 30:70 to 70:30.

  Moreover, the total substitution degree of the cellulose ester which comprises a cellulose ester fiber is 2.5-3.0, and it can employ | adopt suitably that the acyl group carbon number of at least one part of a cellulose ester is 3-18.

  Furthermore, it can be suitably employed that the cellulose ester constituting the cellulose ester fiber is cellulose acetate propionate and / or cellulose acetate butyrate.

  Furthermore, the single yarn fineness of the cellulose ester fiber is preferably 0.05 to 0.9 dtex or less.

    A wiping cloth comprising cellulose ester fibers having at least a portion of cellulose and synthetic fibers having an official moisture content of 0 to 2.5%, wherein the ratio of cellulose ester fibers to synthetic fibers is 30:70 to 70:30 In addition, a wiping cloth characterized in that at least a part of the surface of the wiping cloth is cellulose can also be suitably used.

  ADVANTAGE OF THE INVENTION According to this invention, the wiping cloth which has the outstanding wiping performance with respect to oil-based dirt, and the outstanding wiping performance with respect to aqueous | water-based dirt can be provided. This wiping cloth can be used for household materials such as glasses, furniture, and metal products, and also for industrial materials such as ICs and semiconductors. Moreover, it can employ | adopt suitably also for use in the clean room etc. where dust generation becomes a problem.

  Hereinafter, the wiping cloth excellent in wiping performance of the aqueous dirt and oily dirt of the present invention will be described in detail.

  The wiping cloth excellent in wiping performance of aqueous stains and oily stains according to the present invention includes at least one cellulose ester fiber having an official moisture content of 3 to 8% and synthetic fiber having an official moisture content of 0 to 2.5%. Part.

  The official moisture content of the cellulose ester fiber of the present invention is 3 to 8%. If the official moisture content is 3% or more, sufficient hydrophilicity can be obtained to remove aqueous stains. The official moisture content is preferably 3.5% or more. On the other hand, it is difficult to make the official moisture content larger than 8%. The official moisture content is more preferably 7% or less, and further preferably 6% or less. In the present invention, when at least a part of the cellulose ester fiber is cellulose, the official moisture content can be increased, and for example, the official moisture content can be 8 to 11%.

  The official moisture content of the synthetic fiber of the present invention is 0 to 2.5%. If the official moisture content is 2.5% or less, sufficient lipophilicity can be obtained to remove oily soil. The official moisture content is more preferably 2% or less, and further preferably 1.5% or less.

  In the wiping cloth excellent in wiping performance of the aqueous dirt and oily dirt of the present invention, the ratio of the cellulose ester fiber and the synthetic fiber present on the surface of the wiping cloth is 30:70 to 70:30. The ratio of fibers present on the surface of the wiping cloth is determined by observing the side of the fiber with a scanning electron microscope (SEM), calculating the area occupied by the cellulose ester fiber, the area occupied by the synthetic fiber, and the area occupied by all the fibers. The value calculated based on the ratio of the cellulose ester fiber and the synthetic fiber present on the surface is described in detail in the examples.

  If the ratio of cellulose ester fiber to synthetic fiber present on the surface of the wiping cloth is 30:70 to 70:30, both hydrophilic and sufficient lipophilic properties are sufficient to remove aqueous and oily soils. Can be combined. The ratio of the cellulose ester fiber and the synthetic fiber present on the surface of the wiping cloth is more preferably 35:65 to 65:35, and further preferably 40:60 to 60:40.

  The cellulose ester fiber of the present invention can be used without particular limitation as long as the official moisture content is 3 to 8%, and cellulose acetate having an acetyl group as an acyl group can be shown as an example. The cellulose acetate may be a cellulose diacetate having a total substitution degree of about 2.4 to 2.6, or may be a cellulose triacetate having a total substitution degree of about 2.8 to 3.0.

  From the viewpoint of the wine ping performance of the wine ping cloth and the durability of the wine pin cloth itself, the cellulose ester of the present invention is preferably a cellulose ester having 3 to 18 acyl group carbon atoms. By setting the number of carbon atoms of at least a portion of the acyl group to 3 to 18, a wiping cloth having high flexibility of the cellulose ester fiber and excellent wiping workability can be obtained, so that it can be suitably used.

  Specific examples of the cellulose ester having at least a portion of the acyl group having 3 to 18 carbon atoms include, but are not limited to, cellulose acetate propionate, cellulose propionate, cellulose acetate butyrate, and cellulose butyrate. Not. Cellulose acetate propionate in which at least a part of the cellulose ester having 3 to 18 acyl group carbon atoms is bonded to cellulose an acetyl group having 2 acyl group carbon atoms and a propionyl group having 3 acyl group carbon atoms, Further, since the fiber comprising cellulose acetate butyrate in which cellulose has an acetyl group having 2 carbon atoms and a butyryl group having 4 carbon atoms has an appropriate hydrophilicity and moisture absorption and desorption, the present invention In particular, it is preferably used.

When cellulose acetate propionate and / or cellulose acetate butyrate is used as the cellulose ester, the total substitution degree (acetyl substitution degree + acyl substitution degree) of the cellulose ester preferably satisfies the following formula (I). That is, if the total substitution degree (acetyl substitution degree + acyl substitution degree) of the cellulose ester is in the range of 2.5 or more and 3.0 or less, cellulose ester fibers having appropriate hydrophilicity and moisture absorption / release properties are obtained, which is preferable. . The total substitution degree of the cellulose ester is more preferably 2.6 or more and 2.9 or less.
(I) 2.5 ≦ acetyl substitution degree + acyl substitution degree ≦ 3.0
The degree of acetyl substitution and the degree of acyl substitution preferably satisfy the following formulas (II) and (III) in order to have a high heat softening temperature even in the case of fibers and fabrics and to have appropriate hydrophilicity and moisture absorption / release properties.
(II) 1.5 ≦ acetyl substitution degree ≦ 2.5
(III) 0.5 ≦ acyl substitution degree ≦ 1.5
It is preferable that the weight average molecular weight (Mw) of the cellulose ester fiber having 3 to 18 acyl group carbon atoms in the present invention is 50,000 to 250,000. When the weight average molecular weight (Mw) is 50,000 or more, it is preferable because the strength of the cellulose ester fiber is high and a wiping cloth having sufficient durability can be obtained. The weight average molecular weight (Mw) is more preferably 60,000 or more, and still more preferably 80,000 or more. A weight average molecular weight (Mw) of 250,000 or less is preferable because a wiping cloth having high flexibility of the cellulose ester fiber and excellent wiping workability can be obtained. The weight average molecular weight (Mw) is more preferably 220,000 or less, still more preferably 200,000 or less. The weight average molecular weight (Mw) is a value calculated by GPC measurement, and will be described in detail in Examples.

  It is preferable that at least a part of the cellulose ester fiber of the present invention is made of cellulose in terms of improving the wiping property against aqueous dirt due to the improvement of the hydrophilic property of the fiber. Here, that at least a part is cellulose includes, for example, a composite fiber such that the surface layer portion of the fiber is cellulose and the inner layer portion is cellulose ester. Moreover, the fiber which completely hydrolyzed the cellulose ester and all the fibers became cellulose is also wrapped.

  Moreover, the official moisture content of a cellulose-ester fiber can be increased to the range of 8-11% by increasing the ratio of the cellulose to a cellulose-ester fiber. That is, a favorable effect that the wiping property against the aqueous dirt is improved can be exhibited by the improvement of the hydrophilicity accompanying the increase in the official moisture content.

  The cellulose ester fiber of the present invention includes various additives such as plasticizers, antioxidants, matting agents, deodorants, defoaming agents, color modifiers, flame retardants, yarn friction reducing agents, ultraviolet absorbers, Additives such as infrared absorbers, crystal nucleating agents, antioxidants, color pigments, electrostatic agents, antibacterial agents, flame retardants and lubricants may be contained alone or in combination. Absent.

  The cellulose ester fiber of the present invention preferably has a single yarn fineness of 0.05 to 0.9 dtex. If the single yarn fineness is 0.05 dtex or more, it is preferable because a wiping cloth having a sufficient wiping durability can be obtained with less generation of fluff in the wiping operation using the wiping cloth. The single yarn fineness is more preferably 0.07 dtex or more, and further preferably 0.1 dtex or more. On the other hand, if the single yarn fineness is 0.9 dtex or less, a wiping cloth having a large contact area with dirt and an excellent wiping performance can be obtained. The single yarn fineness is more preferably 0.8 dtex or less, and further preferably 0.7 dtex or less.

  Although the fiber physical property of the cellulose ester fiber of the present invention is not particularly limited, from the viewpoint of wiping durability of the wiping cloth, the strength is 0.5 to 2.0 cN / dtex, and the elongation is 8 to 30%. Preferably there is. If the strength is 0.5 cN / dtex or more, the strength of the final wiping cloth product is not insufficient, and it is preferable because it has excellent wiping durability. From the viewpoint of good strength characteristics, the higher the strength, the more preferable, but specifically 0.7 to 2.0 cN / dtex is more preferable, and 0.9 to 2.0 cN / dtex is preferable. Further preferred. Further, if the elongation is 8% or more, the wear resistance of the wiping cloth is good, and the occurrence of fluff is reduced in the wiping operation. The elongation is more preferably 10% or more, and further preferably 15% or more. On the other hand, if the elongation is 30% or less, the dimensional stability of the fabric is good and a wiping cloth excellent in wiping workability can be obtained. The elongation is more preferably 25% or less.

  The cellulose ester fiber of the present invention is not particularly limited with respect to the cross-sectional shape of the fiber, and may be a perfect circular circular cross-section, and may be a multilobal, flat, elliptical, W-shaped, S-shaped, X Different cross-section yarns such as a letter shape, an H shape, a C shape, a paddle shape, a cross-beam shape, and a hollow shape may be used.

  The cellulose ester fiber of the present invention can be processed such as stretching and false twisting in the same manner as general fibers. In addition, weaving and knitting can be handled in the same way as ordinary fibers.

  As the method for producing the cellulose ester fiber of the present invention, a melt spinning method, a dry spinning method, or a wet spinning method can be employed. In the case of adopting a thermoplastic cellulose ester composition, it is possible to obtain a cellulose ester ultrafine fiber having a small single yarn fineness by performing melt spinning. As the cellulose ester composition of the present invention in the case of performing melt spinning, a cellulose ester composition containing at least 70 to 99% by weight of a cellulose ester having 3 to 18 acyl group carbon atoms is preferably used. . It is preferable to dry the cellulose ester composition before melt spinning, so that the moisture content of the composition is 0.3% by weight or less. When the moisture content is 0.3% by weight or less, it can be stably spun without foaming due to moisture at the time of melt spinning. The mechanical properties such as are also good. The moisture content is more preferably 0.2% by weight or less, still more preferably 0.1% by weight or less, and most preferably 0.08% by weight or less.

  The spinning temperature in melt spinning is preferably in the range of 220 ° C to 280 ° C. By setting the spinning temperature to 220 ° C. or higher, the elongational viscosity of the fiber yarn discharged from the spinneret is sufficiently lowered, so that melt fracture (streamline turbulence occurs when the shear stress of the polymer is high when passing through the spinneret hole). This is a phenomenon in which the occurrence of irregularities in the shape of the yarn discharged from the spinneret) is not caused, and a uniform cross-sectional shape and excellent wiping properties can be obtained. preferable. On the other hand, it is preferable to set the spinning temperature to 280 ° C. or lower because the thermal decomposition of the cellulose ester composition can be suppressed and the durability of the wiping cloth due to a decrease in the molecular weight of the obtained fiber does not decrease. The spinning temperature is more preferably 230 ° C to 270 ° C, and further preferably 240 ° C to 260 ° C.

    The method for taking the spun fiber is not particularly limited, and it may be taken using a rotating roller, or may be collected by a net or the like. The spinning speed in the case of taking up using a roller is preferably 500 m / min to 3000 m / min. By setting the spinning speed to 500 m / min to 3000 m / min, a developed fiber structure can be formed, and a wiping cloth having high fiber strength and excellent wiping durability can be obtained. The spinning speed is more preferably 1000 m / min to 2500 m / min. Moreover, after drawing a fiber, you may extend | stretch continuously and may wind up.

  In the case of using an ultrafine fiber having a single yarn fineness of 0.9 dtex or less as the cellulose ester fiber of the present invention, the ultrafine fiber may be obtained by direct spinning, or from an ultrafine fiber-generating fiber, It may be obtained by a method in which at least one component is removed or each component is separated. There are no particular restrictions on the method of generating the ultrafine fibers, and any known method can be employed. In order to obtain the cellulose ester fiber of the present invention, when a composite fiber with a component other than the cellulose ester is used as the ultrafine fiber-generating fiber, the composite component is particularly limited as long as the ultrafine fiber can be generated. Can be used without Specific examples include polystyrene, polyolefin, polyamide, polyester, polylactic acid, sulfoisophthalic acid copolymerized polyester, polyvinyl alcohol, polyethylene glycol, and copolymers and modified polymers thereof, but are not limited thereto. Absent. In particular, when a polylactic acid-based polymer, a sulfoisophthalic acid copolymerized polyester-based polymer, or a polyvinyl alcohol-based polymer is used, cellulose ester ultrafine fibers can be generated by a hot water treatment or an alkaline aqueous solution treatment. Since the characteristic of a cellulose ester fiber is not impaired, it can adopt preferably.

  In the present invention, the cellulose ester fiber comprising at least a part of cellulose can be obtained by producing a cellulose ester fiber and then hydrolyzing an ester bond by saponification treatment, but the production method is not particularly limited. .

  The saponification treatment can be performed in a fiber state, but may be performed after forming a woven fabric, a knitted fabric, a non-woven fabric or the like. It is also possible to perform saponification after blending, blending, and weaving with other materials such as polyester fibers and polyamide fibers.

Since the saponification of the cellulose ester fiber proceeds from the fiber surface layer, when the cellulose ester fiber is saponified, it is converted into a core-sheath type composite fiber in which the surface layer portion of the fiber is cellulose and the inner layer portion is cellulose ester. Moreover, when saponification progresses completely, it is converted into cellulose fibers.
By observing the cross section of the cellulose ester fiber after the saponification treatment, it can be confirmed that the saponification has progressed. Moreover, it can be confirmed that saponification has progressed from the weight loss rate of the cellulose ester fiber before and after the saponification treatment, or the weight loss rate of the fabric made of the cellulose ester fiber and the synthetic fiber before and after the saponification treatment.

  When a cellulose ester fiber is saponified in a fiber state and then made into a fabric together with a synthetic fiber, the ratio of fibers existing on the surface of the wiping cloth made into a fabric is set to 30:70 to 70:30, whereby the surface of the wiping cloth It is preferable that at least a part thereof can be made of cellulose and can have both hydrophilicity and sufficient lipophilic properties to remove aqueous soils and oily soils.

  When saponifying a wiping cloth formed using cellulose ester fibers and synthetic fibers, the ratio of fibers existing on the surface of the wiping cloth before the saponification treatment is 30:70 to 70:30, At least a part of the surface of the wiping cloth can be made of cellulose, which is preferable because it can have both hydrophilicity and sufficient lipophilicity to remove aqueous and oily soils.

  The method for saponifying the cellulose ester fiber is not particularly limited, but a method using an aqueous solution containing an alkali compound can be preferably employed. Examples of the alkali compound include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, weak acid salts of alkali metals such as sodium carbonate and potassium carbonate, and the like, and these may be used alone or in combination.

  The concentration of the aqueous solution containing the alkali compound can be arbitrarily determined according to the strength of the alkali compound and the processing temperature. When a strong alkali alkali metal hydroxide is used, it is preferably used at a concentration of 0.5 wt% to 10 wt%. If it is 0.5% by weight or more, the saponification treatment can be performed efficiently, so that the productivity is improved. If it is 10% by weight or less, fiber embrittlement due to the saponification treatment can be suppressed. More preferably, they are 1 weight% or more and 5 weight% or less.

  In the saponification treatment in the present invention, a known alkali weight loss accelerator such as a quaternary ammonium salt can be used in combination as required.

  In the saponification treatment in the present invention, depending on the shape of the object to be saponified, the processing solution is padded in addition to the cheese dyeing machine, liquid flow dyeing machine, wins, zicker and beam dyeing machine that are usually used for dyeing processing. After that, normal pressure steam, pressurized steam, dry heat treatment and the like can be appropriately used, but are not limited thereto.

  If the official moisture content is 0 to 2.5%, the synthetic fiber of the present invention can be used without particular limitation. Examples of synthetic fibers include polyester fibers such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate and polylactic acid, polyamide fibers such as nylon 6 and nylon 66, polyolefin fibers such as polyethylene and polypropylene, polyurethane fibers and acrylic fibers. Examples thereof include, but are not limited to, fibers.

  The synthetic fiber of the present invention preferably has a single yarn fineness of 0.05 to 1.0 dtex. A single yarn fineness of 0.05 dtex or more is preferable because a wiping cloth having a sufficient durability can be obtained with less generation of fluff in a wiping operation using a wiping cloth. The single yarn fineness is more preferably 0.07 dtex or more, and further preferably 0.1 dtex or more. On the other hand, if the single yarn fineness is 1.0 dtex or less, a wiping cloth having a large contact area with dirt and excellent wiping properties can be obtained. The single yarn fineness is more preferably 0.9 dtex or less, and further preferably 0.8 dtex or less.

  The synthetic fiber of the present invention is not particularly limited with respect to the cross-sectional shape of the fiber, and may be a perfect circular circular cross-section, or a multilobal, flat, elliptical, W-shaped, S-shaped, X-shaped. , H-shaped, C-shaped, paddy-shaped, cross-girder, and hollow shaped cross-section yarns may be used. The cross-sectional shape of the fiber may be the same or different between the cellulose ester fiber and the synthetic fiber.

  The synthetic fiber production method of the present invention includes any of a melt spinning method, a composite spinning method in which a multi-component polymer is spun using the same die and the same discharge hole, a dry spinning method using a solvent, and a wet spinning method. It may be by a method.

  The form of the fabric constituting the wiping cloth of the present invention is not particularly limited, and can be made into a woven fabric, a knitted fabric, a pile fabric, a non-woven fabric, or the like according to a known method, but from the viewpoint of wiping workability, the size of the fabric is a dimension. It is preferable to adopt a fabric form having excellent stability.

  Further, the wiping cloth may be any woven structure or knitted structure, and plain woven, twill woven, satin woven or these changed knitted fabrics, warp knitted, weft knitted, circular knitted, lace knitted or their changed knitted knitted fabric are preferable. Can be adopted. In the case of using a non-woven fabric, a known method such as a needle punch method or a hydroentanglement method can be used.

  The fibers constituting the wiping cloth of the present invention may be combined by combining a cellulose ester fiber and a synthetic fiber by a method of knitting or a method of knitting when making a fabric, or a mixed yarn of the cellulose ester fiber and the synthetic fiber. The fabric may be manufactured from the following. Examples of the method for producing the blended yarn include, but are not limited to, a conventionally known post-mixing method and a spinning blending method. As the post-mixing method, both fibers are supplied and mixed in the twisting process, both fibers are supplied and mixed in the drawing process, and both fibers are supplied and mixed in the false twisting process. Examples thereof include, but are not limited to, a method of fiber mixing, a method of fiber mixing by air entanglement, a method of fiber mixing by Taslan processing, a method of fiber mixing by twisting, yarn combining, and drawing. The spinning blending method includes a method of discharging yarns from two or more types of bases having different hole shapes and numbers of holes and combining and winding them at the time of winding, or a plurality of methods from a single base having a plurality of discharge holes perforated. Although the method of discharging and winding up a yarn simultaneously is mentioned, It is not limited to these.

  The method for dyeing the wiping cloth of the present invention is not particularly limited, and it can be dyed or printed according to a known method. In the case of dip dyeing, a known dyeing machine such as a cheese dyeing machine or a liquid dyeing machine can be suitably employed. As the dye, a disperse dye for acetate and polyester can be suitably used. The dyeing temperature is also not particularly limited, but a temperature of 80 to 130 ° C. is preferable because a wiping cloth having excellent color developability can be obtained.

The basis weight of the wiping cloth of the present invention can be arbitrarily selected according to the application. When the fabric weight is 20 g / m ² or more and 100 g / m ² or less, it is preferable that the fabric is easily adhered to the finger or the like when wrapping around the finger or the like and the wiping operation is easy. On the other hand, when the a thick cloth in such a large 300 g / ^{m 2} or less than 100 g / ^{m 2} basis weight, easy to the wiping operation in hand fabric preferred.

  Since the wiping cloth of the present invention has excellent wiping performance against both aqueous and oily dirt, it is used for living materials such as eyeglasses, furniture, metal products, and ICs and semiconductors. It can be used for industrial materials such as Moreover, it can employ | adopt suitably also for use in the clean room etc. where dust generation becomes a problem.

Hereinafter, the present invention will be described in more detail with reference to examples. Each characteristic value in the examples is obtained by the following method.
A. Weight average molecular weight (Mw) measurement by GPC It was completely dissolved in tetrahydrofuran so that the concentration of the cellulose ester was 0.15% by weight, and used as a sample for GPC measurement. Using this sample, GPC measurement was performed with Waters 2690 under the following conditions, and the weight average molecular weight (Mw) was determined in terms of polystyrene. In addition, the measurement was performed 3 times per sample, and the average value was defined as Mw.

Column: Two Tosoh TSK gel GMHHR-H connected Detector: Waters2410 Differential refractometer RI
Moving bed solvent: Tetrahydrofuran Flow rate: 1.0 ml / min Injection volume: 200 μl
B. Official moisture content The official moisture content was measured based on JIS L0105-2006. In addition, the measurement was performed 3 times per sample, and the average value was defined as the official moisture content.
C. Boiling water shrinkage rate The sample was scraped and measured for sample length L0 under a load of 0.09 cN / dtex, and then treated in boiling water for 15 minutes under no load. After the treatment, the sample was air-dried, the sample length L1 was measured under a load of 0.09 cN / dtex, and calculated using the following formula. In addition, the measurement was performed 5 times per sample, and the average value was defined as the boiling water shrinkage.

Boiling water shrinkage (%) = {(L0−L1) / L0} × 100
D. Fiber surface ratio A platinum-palladium alloy was vapor-deposited on the prepared fabric, and the fiber side surface was observed with a scanning electron microscope (SEM). Calculate the area occupied by the yarn A (A), the area occupied by the yarn B (B), and the area occupied by all the fibers (C), and calculate the ratio of the yarn A and the yarn B existing on the fabric surface. did.

SEM apparatus: Hitachi S-4000 type Yarn A: Yarn B = (A / C): (B / C)
E. Water absorption The water absorption time was measured on the basis of JIS L1907-2004 7.1.1 (drop method). In addition, the measurement was performed 5 times per sample, and the average value was taken as the water absorption time. It shows that water absorption is so favorable that a numerical value is small. “Water absorption time is less than 1 second” is ◎, “Water absorption time is from 1 second to less than 2 seconds” ○, “Water absorption time is from 2 seconds to less than 5 seconds” is △, “Water absorption time is more than 5 seconds” is × , “O” of “water absorption time of 1 second or more and less than 2 seconds” was regarded as acceptable.
F. Wiping property A wiping cloth was fixed to one end surface of a cylindrical weight (diameter: 45 mm, weight: 1 kg) using a rubber band through a woven fabric having a thickness of about 1 mm as a cushioning material. A cylindrical weight on which a fabric sample was fixed was placed on a glass plate in which about 5 mg of silicone oil SH200 (manufactured by Toray Dow Corning Silicone) was dropped with an injection needle. The cylindrical weight was moved at a speed of 1 m / min to wipe off the silicone oil. Next, toner for dry copying machine (SF-76T: manufactured by Sharp) was sprinkled on a glass plate, and the toner was blown off with compressed air. Next, the degree of toner adhered to the cello tape (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.) by sticking Cellotape (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.) to the surface of the glass plate, peeling off the residual toner on the glass plate. Was determined by visual observation on white paper. “No toner left” is indicated by “◎”, “No toner left” is indicated by ○, “Toner is left a little” is indicated by △, “Toner is left substantially” is indicated by ×, and “Toner is almost left” “Not done” ○ or better.
G. Dust generation property A cloth sample was fixed to a weight in the same manner as in the above wiping property test, and placed on a glass plate on which silicone oil was not dropped. After moving the cylindrical weight at a speed of 1 m / min, the fluff remaining on the glass plate was determined by visual observation. ◎ “No fuzz left”, “No fuzz left” ○, “Fuzz left a little” △, “Fuzz left a lot” x, “Fuzz left almost “Not done” ○ or better.
H. Wipe durability After wiping off the silicone oil on the glass plate using a cloth sample in the same manner as in the above wiping test, about 5 mg of silicone oil was newly added without sprinkling the toner for the dry copying machine on the glass plate. Was added to the glass plate and wiped off. Using the same fabric sample, the wiping operation was repeated 30 times, and then a toner for dry copying machine (SF-76T: manufactured by Sharp) was sprinkled on the glass plate, and the toner was blown off with compressed air. Next, the degree of toner adhered to the cello tape (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.) by sticking Cellotape (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.) to the surface of the glass plate, peeling off the residual toner on the glass plate. Was determined by visual observation on white paper. “Excellent (no toner left after wiping 30 times)” ◎, “Excellent (little toner left after wiping 30 times)” ◯, “Normal (toner after wiping 30 times) “Slightly remained” ”was evaluated as Δ,“ Inferior (toner remained considerably after wiping 30 times) ”was evaluated as“ x ”, and“ Excellent ”○ or more was determined as“ Pass ”.
I. Weight loss rate When the weight of the dried fabric before saponification was W0 and the weight of the dried fabric after saponification was W1, it was expressed as (W0−W1) / W0 × 100. The fabric was dried for 2 hours with a dryer at 60 ° C.

Synthesis example 1
To 100 parts by weight of cellulose (dissolved pulp manufactured by Nippon Paper Industries Co., Ltd.), 240 parts by weight of acetic acid and 67 parts by weight of propionic acid were added and mixed at 50 ° C. for 30 minutes. After the mixture was cooled to room temperature, 172 parts by weight of acetic anhydride cooled in an ice bath and 168 parts by weight of propionic anhydride were added as an esterifying agent, and 4 parts by weight of sulfuric acid was added as an esterification catalyst, followed by stirring for 150 minutes. An esterification reaction was performed. In the esterification reaction, when it exceeded 40 ° C., it was cooled in a water bath. After the reaction, a mixed solution of 100 parts by weight of acetic acid and 33 parts by weight of water was added as a reaction terminator over 20 minutes to hydrolyze excess anhydride. Thereafter, 333 parts by weight of acetic acid and 100 parts by weight of water were added, and the mixture was heated and stirred at 80 ° C. for 1 hour. After completion of the reaction, an aqueous solution containing 6 parts by weight of sodium carbonate was added, and the precipitated cellulose acetate propionate was filtered off, subsequently washed with water, and dried at 60 ° C. for 4 hours. The cellulose acetate propionate thus obtained had an acetyl substitution degree of 2.0, a propionyl substitution degree of 0.7 (total cellulose ester substitution degree of 2.7), and a weight average molecular weight (Mw) of 178,000. It was.

Synthesis example 2
Cellulose acetate propionate was synthesized in the same manner as in Synthesis Example 1 except that acetic anhydride was changed to 193 parts by weight and propionic anhydride was changed to 111 parts by weight. The obtained cellulose acetate propionate had an acetyl substitution degree of 2.4, a propionyl substitution degree of 0.5 (total cellulose ester substitution degree of 2.9), and a weight average molecular weight (Mw) of 175,000. It was.

Synthesis example 3
Cellulose acetate propionate was synthesized in the same manner as in Synthesis Example 1 except that acetic anhydride was changed to 138 parts by weight and propionic anhydride was changed to 261 parts by weight. The obtained cellulose acetate propionate had an acetyl substitution degree of 1.5, a propionyl substitution degree of 1.0 (total substitution degree of cellulose ester of 2.5), and a weight average molecular weight (Mw) of 183,000. It was.

Example 1
Cellulose acetate propionate produced in Synthesis Example 1 82.0% by weight, polyethylene glycol (PEG 600) having an average molecular weight of 600 17.9% by weight, and bis (2,6-di-t-butyl) as a phosphite colorant -4-methylphenyl) pentaerythritol diphosphite 0.1% by weight was kneaded at 230 ° C. using a biaxial extruder and cut to about 5 mm to obtain cellulose ester composition pellets (MW 166,000). .

  The cellulose ester composition pellets obtained by the above production method were vacuum-dried at 80 ° C. for 8 hours and introduced into a melt spinning pack having a spinning temperature of 260 ° C. .. 20 mm, hole length 0.40 mm) was spun from a spinneret having 144 holes. This spun yarn is passed through an airflow blocking plate, cooled by cooling air with an air temperature of 25 ° C. and an air speed of 0.2 m / sec, and then concentrated by applying an oil agent with an oil supply device and rotating at 1000 m / min. Take up with a first godet roller and take up with a winder rotating at a speed of winding tension of 0.09 cN / dtex via a second godet roller rotating at the same speed as the first godet roller. Then, cellulose ester fibers (120 dtex-144 fil) were obtained as the yarn A.

  Weaving a plain woven fabric using yarn A as the warp and polyethylene terephthalate fiber (95 dtex-180 fil: single yarn fineness of 0.53 dtex) as the yarn B as the weft, and the oil agent by hot water scouring at 70 ° C. for 20 minutes After removal (single yarn fineness 0.68 dtex of scoured yarn A), dry heat setting was performed at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1. The hydrophilic cellulose ester fiber exhibits extremely excellent water absorption, and the hydrophobic polyester fiber exhibits extremely excellent oil wiping performance. It was. Further, no fluff was generated from the fabric after wiping, and the dust generation was extremely excellent. Furthermore, even when the wiping operation was repeated, no deterioration in wiping property was observed, and the wiping durability was extremely excellent.

Example 2
78.0% by weight of cellulose acetate propionate prepared in Synthesis Example 2, 21.9% by weight of polyethylene glycol (PEG 600) having an average molecular weight of 600, and bis (2,6-di-t-butyl as a phosphite colorant -4-methylphenyl) pentaerythritol diphosphite 0.1% by weight was kneaded at 230 ° C. using a biaxial extruder and cut to about 5 mm to obtain a cellulose ester composition pellet (MW 164,000). .

  Cellulose ester fibers (120 dtex-144 fil) were obtained as yarn A in the same manner as in Example 1 except that the cellulose ester composition pellets obtained by the above production method were used.

  Weaving a plain woven fabric using yarn A as the warp and polyethylene terephthalate fiber (41 dtex-180fil: single yarn fineness of 0.53 dtex) as the yarn B as the weft, and the oil agent by hot water scouring at 70 ° C. for 20 minutes After removal (single yarn fineness of scoured yarn A: 0.65 dtex), dry heat setting was performed at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1. Even when the substitution degree of the cellulose ester constituting the yarn A is different from that in Example 1, water absorption, wiping property, dust generation property, It was extremely excellent in wiping durability.

Example 3
92% by weight of cellulose acetate propionate (CAP 482-20) manufactured by Eastman Chemical Co., which has an acetyl substitution degree of 0.2 and a propionyl substitution degree of 2.5 (cellulose ester total substitution degree of 2.7), an average molecular weight of 600 A biaxial extract of 7.9% by weight of polyethylene glycol (PEG 600) and 0.1% by weight of bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite as a phosphite colorant It knead | mixed at 230 degreeC using the ruder, and cut to about 5 mm, and obtained the cellulose-ester composition pellet (MW161,000).

  Using the cellulose ester composition pellets obtained by the above-mentioned production method as an island component, poly L-lactic acid (optical purity 98% L-lactic acid) having a weight average molecular weight of 152,000 and a residual lactide content of 0.1% by weight is used as a sea component. And melt separately using a compound spinning machine (sea: 230 ° C., island: 235 ° C.), sea island type composite die having 16 island components and 12 holes at a spinning temperature of 235 ° C. (discharge hole diameter: 0.5 mmφ) (The sea / island ratio was 30/70% by weight). This spun yarn is passed through a heat insulating cylinder installed below the spinneret surface, and then cooled by cooling air with an air temperature of 20 ° C. and an air speed of 0.5 m / sec. Taken up by a first godet roller rotating at 2300 m / min, wound up by a winder through a second godet roller rotating at the same speed as the first godet roller, and sea island type cellulose ester as yarn A A composite fiber (56 dtex-12 fil) was obtained.

  Polyester obtained by copolymerizing polyethylene terephthalate as an island component, ethylene glycol as a glycol component, and terephthalic acid / isophthalic acid / 5-sodium sulfoisophthalic acid (61.5 / 26.0 / 12.5 mol%) as an acid component ( The sea component is a softening point of 155 ° C. and IV = 0.59), and it is discharged from a sea-island type compound base (discharge hole diameter: 0.5 mmφ) having 16 island components and 12 holes (sea / island ratio 20/80% by weight) ), A sea-island type polyester composite fiber (56 dtex-12 fil) was obtained as the yarn B.

  A plain woven fabric was woven using the yarn A as the warp and the yarn B as the weft, the oil agent was removed by hot water scouring at 70 ° C. for 20 minutes, and then dry heat setting was performed at 140 ° C. This fabric was treated with a 1 mol / L aqueous solution of sodium hydroxide at 98 ° C. for 20 minutes to completely leach out the sea components of the yarn A and the yarn B (the single yarn fineness of the yarn A after leaching was 0.1. The finishing set was performed at 19 dtex, the single yarn fineness of the thread B after leaching was 0.23 dtex), and a dry heat of 120 ° C. The evaluation results of the obtained fabric are as shown in Table 1. Although the official moisture content of the cellulose ester fiber was lower than that in Example 1, the water absorption was excellent. Further, the wiping property, dust generation property and wiping durability were extremely excellent.

Example 4
The cellulose ester composition pellets used in Example 1 were used as the island component, ethylene glycol as the glycol component, and terephthalic acid / isophthalic acid / 5-sodium sulfoisophthalic acid (61.5 / 26.0 / 12.5 as the acid component). Mol%) are copolymerized polyester (softening point 155 ° C., IV = 0.59) as a sea component and melted separately using a compound spinning machine (sea: 265 ° C., island: 260 ° C.). It was discharged from a sea-island type composite base having 16 island components and 12 holes (discharge hole diameter: 0.5 mmφ) at 20 ° C. (sea / island ratio 20/80 wt%). After passing this spun yarn through a heating cylinder, it is cooled by cooling air with an air temperature of 20 ° C. and an air speed of 0.5 m / sec. Taken up by a first godet roller rotating at 2300 m / min, wound up by a winder through a second godet roller rotating at the same speed as the first godet roller, and sea island type cellulose ester composite as yarn A Fiber (56 dtex-12 fil) was obtained.

  Yarn A and yarn B used in Example 3 were mixed by air entanglement at a mixing ratio of 50:50 to obtain a uniform mixed yarn. A plain fabric was woven using the mixed yarn as warp and weft, and the oil agent was removed by hot water scouring at 70 ° C. for 20 minutes, followed by dry heat setting at 140 ° C. This fabric was treated with a 1 mol / L aqueous solution of sodium hydroxide at 98 ° C. for 20 minutes to completely leach out the sea components of the yarn A and the yarn B (the single yarn fineness of the yarn A after leaching was 0.1. The finishing set was performed at 19 dtex, the single yarn fineness of the thread B after leaching was 0.23 dtex), and a dry heat of 120 ° C. The evaluation results of the obtained fabric are as shown in Table 1, and the performances of water absorption, wiping property, dust generation property, and wiping durability were all excellent.

Example 5
The yarn A and yarn B used in Example 4 were mixed by air entanglement at a mixing ratio of 50:50 to form a uniform mixed yarn, and then circular knitting was produced using a circular knitting machine. The oil agent was removed by hot water scouring at 20 ° C. for 20 minutes. This knitted fabric was treated with a 1 mol / L aqueous solution of sodium hydroxide at 98 ° C. for 20 minutes to completely leach out the sea components of the yarn A and the yarn B (the single yarn fineness of the yarn A after leaching was 0.19 dtex). The single yarn fineness of the thread B after leaching is 0.23 dtex). The evaluation results of the obtained fabric are as shown in Table 1, and had extremely excellent water absorption and dust generation. Moreover, although the dimensional stability of the fabric was lower than that of the fabric, it had excellent wiping properties and wiping durability.

Example 6
Polyethylene having an acetyl substitution degree of 1.0 and a butyryl substitution degree of 1.7 (total cellulose ester substitution degree of 2.7), 85% by weight of cellulose acetate butyrate (CAB381-20) manufactured by Eastman Chemical Co., and an average molecular weight of 600 Glycol (PEG600) 14.9% by weight and bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite 0.1% by weight as a phosphite anti-coloring agent were added to a biaxial extruder. The resulting mixture was kneaded at 230 ° C. and cut to about 5 mm to obtain cellulose ester composition pellets (MW 181,000).

  The cellulose ester composition obtained by the above production method is used as an island component, while poly L-lactic acid (optical purity 98% L-lactic acid) having a weight average molecular weight of 152,000 and a residual lactide content of 0.1% by weight is used as a sea component. And melted separately using a compound spinning machine (sea: 230 ° C., island: 235 ° C.), a sea-island type compound base having 32 island components and 12 holes at a spinning temperature of 235 ° C. (discharge hole diameter 0.5 mmφ) ) (Sea / island ratio 20/80% by weight). This spun yarn is passed through a heat insulating cylinder installed below the spinneret surface, and then cooled by cooling air with an air temperature of 20 ° C. and an air speed of 0.5 m / sec. Taken up by a first godet roller rotating at 2300 m / min, wound up by a winder through a second godet roller rotating at the same speed as the first godet roller, and sea island type cellulose ester as yarn A A composite fiber (80 dtex-12 fil) was obtained.

  Weaving a plain woven fabric using yarn A as the warp and polyethylene terephthalate fiber (50 dtex-72 fil: single yarn fineness 0.69 dtex) as the yarn B as the weft, and the oil agent by hot water scouring at 70 ° C. for 20 minutes After the removal, dry heat setting was performed at 140 ° C. This fabric is treated with a 1 mol / L aqueous solution of sodium hydroxide at 98 ° C. for 20 minutes to completely leach out the sea component of the yarn A (single yarn fineness of the yarn A after leaching is 0.14 dtex), and then dried. Finish setting was performed at 120 ° C. The evaluation results of the obtained fabric are as shown in Table 1. Even when cellulose acetate butyrate is used as the cellulose ester constituting the cellulose ester fiber, water absorption, wiping property, dust generation property and wiping durability are obtained. It was very good.

Example 7
84.0% by weight of cellulose acetate propionate prepared in Synthesis Example 3, 15.9% by weight of polyethylene glycol (PEG 600) having an average molecular weight of 600, and bis (2,6-di-t-butyl) as a phosphite colorant -4-methylphenyl) pentaerythritol diphosphite 0.1% by weight was kneaded at 230 ° C. using a biaxial extruder and cut to about 5 mm to obtain cellulose ester composition pellets (MW 171,000). .

  Cellulose ester fibers (108 dtex-144 fil) were obtained as the yarn A in the same manner as in Example 1 except that the discharge rate was 9.0 g / min using the cellulose ester composition pellets obtained by the above production method.

  Weaving a plain fabric using yarn A as the warp and polylactic acid fiber (35 dtex-36fil: single yarn fineness of 0.97 dtex) as the yarn B as the weft, and the oil agent by hot water scouring at 70 ° C. for 20 minutes After removal (single yarn fineness of scoured yarn A: 0.53 dtex), dry heat setting was performed at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1. Even when polylactic acid fibers were used as the lipophilic fibers, the wipes were excellent in wiping properties and extremely excellent in water absorption, dust generation and wiping durability. .

Example 8
Cellulose ester fibers (100 dtex-72 fil) were obtained as yarn A in the same manner as in Example 1 except that the discharge rate was 10.5 g / min and the base used was 72 holes. A plain woven fabric was prepared in the same manner as in Example 1 using the yarn A as the warp and the polyethylene fiber as the yarn B as the weft (47 dtex-48 fil: single yarn fineness 0.98 dtex) (yarn A after scouring) Single yarn fineness of 1.1 dtex). The evaluation results of the obtained fabric are as shown in Table 1. Even when polyethylene fibers were used as the lipophilic fibers, the water absorption, dust generation, and wiping durability were excellent. In addition, the wipeability was good despite the fact that the contact area between the soil and the fabric surface was reduced due to the single yarn fineness of the cellulose ester fiber being greater than 0.9 dtex.

Example 9
Acetate fiber (84 dtex-20fil: single yarn fineness 4.2 dtex) having a degree of acetyl substitution of 2.6 as warp yarn A and polyethylene terephthalate fiber (68 dtex-72fil: single yarn fineness 0.94 dtex as weft yarn B) ), And the oil agent was removed by hot water scouring at 70 ° C. for 20 minutes, followed by dry heat setting at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1. Since the single yarn fineness of the cellulose ester fiber is large, the wiping performance and dust generation were slightly inferior to those of Example 1, but excellent wiping performance. showed that.

Example 10
A plain woven fabric was prepared in the same manner as in Example 9 except that the warp yarn was a triacetate fiber having a degree of acetyl substitution of 2.9 (84 dtex-20 fil: single yarn fineness of 4.2 dtex). The evaluation results of the obtained fabric are as shown in Table 1. Since the single yarn fineness of the cellulose ester fiber is large, the wiping performance and dust generation were slightly inferior to those of Example 1, but excellent wiping performance. showed that.

Example 11
A plain woven fabric was woven in the same manner as in Example 1, and the oil agent was removed by hot water scouring at 70 ° C. for 20 minutes (single yarn fineness of yarn A after scouring was 0.68 dtex, single yarn fineness of yarn B was 0. 53 dtex). This fabric was saponified with 95% 3% aqueous sodium hydroxide solution for 20 minutes. The treated fabric was thoroughly washed with water, neutralized and washed with a 1 g / L aqueous solution of acetic acid at 60 ° C., and then dried. Since the weight loss rate of the fabric after the saponification treatment was 35%, the yarn A was converted into cellulose fibers by the saponification treatment (the single yarn fineness of the yarn A after the saponification treatment was 0.44 dtex, the yarn B). Single yarn fineness of 0.50 dtex). The evaluation results of the obtained fabric are as shown in Table 1 and showed extremely excellent wiping performance. In particular, compared with cellulose fibers such as cotton and rayon, the single yarn fineness was extremely small and the generation of fluff was extremely small, so that the wiping property and dust generation were extremely excellent.

Example 12
A fabric was produced in the same manner as in Example 11 except that the saponification time was 5 minutes. Since the weight loss rate of the fabric after the saponification treatment was 5%, the yarn A was converted into cellulose fibers by the saponification treatment. Further, when the yarn A was pulled out from the saponified fabric and the cross section thereof was photographed with an optical microscope, it was clear that the cross section had a double structure and only the surface layer was celluloseized. From this, the yarn A was converted into a core-sheath type composite fiber in which the surface layer portion of the fiber was cellulose and the inner layer portion was cellulose ester (the single yarn fineness of the yarn A after saponification treatment was 0.61 dtex, The single yarn fineness of the yarn B is 0.52 dtex). The evaluation results of the obtained fabric are as shown in Table 1 and showed extremely excellent wiping performance. In particular, compared with cellulose fibers such as cotton and rayon, the single yarn fineness was extremely small and the generation of fluff was extremely small, so that the wiping property and dust generation were extremely excellent.

Comparative Example 1
A plain woven fabric was produced in the same manner as in the yarn B of Example 1, except that the polyethylene terephthalate fiber had a boiling water shrinkage of 15% and was changed to 33 dtex-6 fill and a single yarn fineness of 5.5 dtex. The evaluation results of the obtained fabric are as shown in Table 1, and were extremely excellent in water absorption and dust generation. However, due to the extremely high boiling water shrinkage of polyethylene terephthalate fibers, the cellulose ester fibers, which are hydrophilic fibers, accounted for most of the fabric surface, so the cellulose ester fibers and polyethylene terephthalate fibers present on the fiber surface The ratio of 98: 2 was mostly cellulose ester fibers, and the oil wiping property was poor. Furthermore, when the wiping operation was repeated, oil was gradually accumulated on the surface of the fabric, and the wiping performance was deteriorated, resulting in poor wiping durability.

Comparative Example 2
In Example 4, a plain woven fabric was produced in the same manner except that the blend ratio of the yarn A and the yarn B was changed to 10:90. The evaluation results of the obtained fabric are as shown in Table 1, and although it is excellent in wiping property, dust generation property and wiping durability, polyethylene terephthalate fiber which is a hydrophobic fiber due to the change in the mixing ratio Occupies most of the surface of the fabric, and was inferior in water absorption.

Comparative Example 3
A plain fabric is woven using 80-th cotton (yarn fineness: 74 dtex) as the warp, and polyethylene terephthalate fiber (130 dtex-144fil: 0.90 dtex) as the weft as the yarn B. 70 After removing the oil by hot water scouring at 20 ° C. for 20 minutes, dry heat setting was performed at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1. Although the water absorbability is excellent, the cotton single yarn fineness is large, so that the oil wiping property is inferior. Furthermore, when the wiping operation was repeated, oil was gradually accumulated on the surface of the fabric, and the wiping performance was deteriorated, resulting in poor wiping durability. In addition, a lot of fluff was observed from the fabric after wiping, and the dust generation was inferior.

Comparative Example 4
A plain woven fabric was produced in the same manner as in Example 1 except that the yarn B was changed to the cellulose ester fiber used in Example 1. The evaluation results of the obtained fabric are as shown in Table 1 and were excellent in water absorption and dust generation. However, since the entire fabric surface was composed of cellulose ester fibers, which are hydrophilic fibers, the oil wiping property was poor. Furthermore, when the wiping operation was repeated, oil was gradually accumulated on the surface of the fabric, and the wiping performance was deteriorated, resulting in poor wiping durability.

Comparative Example 5
A plain fabric is woven using the cellulose ester fiber used in Example 1 as the yarn A for the warp and the 80th cotton yarn (single yarn fineness 74 dtex) as the yarn B for the weft, and heat at 70 ° C. for 20 minutes. After removing the oil agent by water scouring, dry heat setting was performed at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1 and were extremely excellent in water absorption. However, since the entire fabric surface was composed of cellulose ester fibers and cotton, which are hydrophilic fibers, the oil wiping property was poor. Furthermore, when the wiping operation was repeated, oil was gradually accumulated on the surface of the fabric, and the wiping performance was deteriorated, resulting in poor wiping durability. In addition, a lot of fluff was observed from the fabric after wiping, and the dust generation was inferior.

Comparative Example 6
Weaving a plain woven fabric using polyethylene terephthalate fiber with 78 dtex-216fil and single yarn fineness of 0.36 dtex as warp yarn as yarn A and weft yarn as yarn B, and oiling by hot water scouring at 70 ° C for 20 minutes After removing the heat, a dry heat set was performed at 140 ° C. The evaluation results of the obtained fabric are as shown in Table 1, and were extremely excellent in wiping properties, dust generation properties, and wiping durability. However, since the whole fabric surface was comprised by the polyethylene terephthalate fiber which is a hydrophobic fiber, it was inferior to water absorption.

  The wiping cloth of the present invention has excellent wiping performance against both aqueous and oily dirt. Therefore, it can be used for daily life materials such as glasses, furniture, and metal products, and further for industrial materials such as ICs and semiconductors. Moreover, it can employ | adopt suitably also for use in the clean room etc. where dust generation becomes a problem.

Claims (5)

  A wiping cloth comprising at least a part of cellulose ester fiber having an official moisture content of 3 to 8% and a synthetic fiber having an official moisture content of 0 to 2.5%, the cellulose ester existing on the surface of the wiping cloth A wiping cloth characterized in that the ratio of fiber to synthetic fiber is 30:70 to 70:30.   The total degree of substitution of the cellulose ester constituting the cellulose ester fiber is 2.5 to 3.0, and at least a part of the acyl group carbon number of the cellulose ester is 3 to 18. Wiping cloth.   The wiping cloth according to claim 1 or 2, wherein the cellulose ester constituting the cellulose ester fiber is cellulose acetate propionate and / or cellulose acetate butyrate.   The wiping cloth according to any one of claims 1 to 3, wherein the single yarn fineness of the cellulose ester fiber is 0.05 to 0.9 dtex.   A wiping cloth comprising cellulose ester fibers having at least a portion of cellulose and synthetic fibers having an official moisture content of 0 to 2.5%, wherein the ratio of cellulose ester fibers to synthetic fibers is 30:70 to 70:30 And at least a part of the surface of the wiping cloth is cellulose.